The word laser is an acronym for: light amplification by stimulated emission of radiation. It’s a device that creates and amplifies a narrow, intense beam of coherent light: light that is of one frequency. Lasers are commonly used in medical science and more recently in cosmetic procedures like hair removal.
In a laser, the atoms or molecules of a crystal, such as ruby or garnet, are excited in what is called the laser cavity so that more of them are at higher energy levels than are at lower energy levels.
Reflective surfaces at both ends of the cavity permit energy to reflect back and forth, building up the power in each passage.
With laser hair removal the laser penetrates the top layer of dermis with a specific wavelength of light (as opposed to multiple wavelengths used in Intense Pulse Light treatments), targeting melanin in the hair follicle.
A hair follicle is a sac from which a hair grows and into which the sebaceous (oil) glands open. The follicle is lined by cells derived from the epidermal (outside) layer of the skin.
Each air follicle normally goes through a five-year cycle of growth and rest, with about 90 percent of the...
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